Sulfur autotrophic denitrification filter material, and preparation method and application thereof

Abstract

The present application relates to sewage treatment technical field, disclose a kind of novel sulfur autotrophic denitrification filter material and its preparation method and application, filter material particle size 3.0-4.0mm, by composite sulfur source (40%-45%, sulfur 70±2%, sodium thiosulfate 30±2%), modified haydite (30%-35%, bimodal pore size 50-100 μm / 200-300 μm), conductive medium (8%-10%, graphene:biochar=3:1), buffer medium (5%-7%, Fe2O3:52%±2%, CaCO3:31%±2%, MgO:17%±2%), binder and inert filler composition.Preparation includes raw material pretreatment, mixing granulation, ladder calcination, gradient impregnation, directional load buffer medium, post-processing and other steps.The filter material releases sulfur by gradient, three-dimensional electron transfer network, multi-stage pore anti-clogging design and composite pH buffer system, solves the problem of traditional filter byproduct accumulation, insufficient microbial adhesion, large pH fluctuation and clogging, suitable for wastewater denitrification treatment, high denitrification efficiency, good stability.

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